/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hugegraph.job.computer;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class ComputerPool {

    private static final ComputerPool INSTANCE = new ComputerPool();

    static {
        INSTANCE.register(new PageRankComputer());
        INSTANCE.register(new WeakConnectedComponentComputer());
        INSTANCE.register(new LpaComputer());
        INSTANCE.register(new TriangleCountComputer());
        INSTANCE.register(new LouvainComputer());
    }

    private final Map<String, Computer> computers;

    public ComputerPool() {
        this.computers = new ConcurrentHashMap<>();
    }

    public Computer register(Computer computer) {
        assert !this.computers.containsKey(computer.name());
        return this.computers.put(computer.name(), computer);
    }

    public Computer find(String name) {
        return this.computers.get(name);
    }

    public static ComputerPool instance() {
        return INSTANCE;
    }
}
